BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 3, pp. 153-172, pls. 3-5 



PRELIMINARY NOTES ON THE DISCOVERY OF A VERTE- 

 BRATE FAUNA IN SILURIAN (ORDOVICIAN) STRATA 



BY 



CHARLES D. WALCOTT 



ROCHESTEB 



PUBLISHED BY THE SOCIETY 



M \it.ii, 1892 



